html{
	height: 100%;
}
body{
	height: 100%;
	margin: 0;
}
div.modal-mask{
	width: 100%;
	height: 100%;
	position: absolute;
	top: 0;
	left: 0;
	background-color: black;
	opacity: 0.5;
	z-index: 99999999;
}
div.modal-box{
	width: 300px;
	height: 150px;
	border: 1px solid silver;
	background-color: #e9e9e9;
	border-radius: 10px;
	position: absolute;
	top: calc((100% - 150px) / 2);
	left: calc((100% - 300px) / 2);
	z-index: 100000000;
	box-shadow: 0 0 2px #444;
	
	/*position:static/relative/absolute/fixed;
	static默认值，不定位
	relative/absolute/fixed都可以作为绝对定位的参考点*/
}
div.modal-box .modal-message{
	text-align: center;
	margin-top: 35px;
	font-size: 18px;
	color: #444;
}
div.modal-box .modal-button-box{
	height: 50px;
	/*background-color: red;*/
	position: absolute;
	bottom: 0;
	width: 100%;
	border-top: 1px solid silver;
	border-bottom-left-radius: 10px;
	border-bottom-right-radius: 10px;
}
.modal-button-box div{
	height: 48px;
	width: 98%;
	margin: 0 auto;
	/*background-color: red;*/
	border-radius: 10px;
	text-align: center;
	line-height: 50px;
	cursor: pointer;
}


